1

MCHAT:
The mchat is a good at home screening tool for autism https://m-chat.Org (many pediatricians use it in the office as well) also healthychildren.Org click on the ages and stages tab. Normal milestones are listed for 1 to 3 months, 4 - 7 months etc.
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Physical exam is the actual examination of the patient's body by the physician. For example, if you sprain your ankle and go to your doctor, he will physically touch your ankle to see where it is painful. This act of touching the patient's body is the physical examination.
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No:
there is no need for concern babies perform "developmental milestones" at different rates and times as he may not roll to one side for a while but may sir or walk early. unless there are several delays combined i would not worry
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3

See below:
Apraxia is difficulty forming sounds into words. The reason for developmental apraxia is unclear. It is not caused by weak muscles. Your child may be able to smile, eat, and make other movements normally. The problem is coordinating all the muscles used to speak.
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6

Patiently...:
Toilet {or "potty"} training is difficult in and of itself; throwing any disability into the mix adds another level of difficulty. Sometimes the 'team' approach is best; and positive reinforcement is helpful. I do not know the exact nature of the disability so i cannot be more specific except do draw from my own parenting experience...When your child is ready then it happens; and not before.
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7

See below:
Your child’s growth and development are kept track of through a partnership between you and your doc. At each well-child visit the doctor looks for developmental delays or problems and talks with you about any concerns you might have. This is called developmental monitoring (or surveillance). Any problems noticed during developmental monitoring should be followed-up with developmental testing.
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8

Comparison:
These judgements are based upon reseach assessing thousands of kids patterns and generating statistical analysis. Then standard milestones are represented. Your pediatrician then compares your child's progresses to these patterns.
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9

Sit, babble, roll :
At 6 months, baby usually can sit for few seconds without support, roll over to both sides, transfer object from one hand to another, babbling, turn to your voice, recognize parents.
More descriptions : http://www.Umm.Edu/ency/article/002008.Htm
http://www.Pamf.Org/children/common/development/.
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10

Sitting, steps, mama:
Your child's first birthday is an exciting time! at age one, most babies will get to a sitting position without assistance, pull self up to stand, and may even take a couple of steps without help. They are able to take objects in and out of containers, and can bang two cubes together. And they start developing expressive language, able to say "mama" and "papa" while trying to imitate words.
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